*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
a{
    text-decoration: none;
    /* 取消下划线 */
    color: inherit;
    /* 文字颜色继承父季 */
}